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sproutient

Zypento Wishlist for WooCommerce adds a lightweight and user-friendly wishlist feature to your WooCommerce store.
With this plugin, customers can click the heart icon on any product to instantly add it to their wishlist. They can then access their wishlist anytime from the My Account page, where they can view saved items and remove them if needed.
No complex setup, no bloated features—just a seamless wishlist experience for your customers that improves engagement and increases return visits.
Key Features:
<ul>
<li>Add or remove products from wishlist with a heart button on product pages and shop loops. </li>
<li>View all saved products in the dedicated Wishlist section on the My Account page. </li>
<li>Remove products from wishlist with a single click. </li>
<li>Works perfectly with WooCommerce and WordPress themes. </li>
<li>Lightweight and fast—no unnecessary bloat.</li>
</ul>
<h3>CSS/JS source</h3>
Unminified CSS/JS are in assets/css/src and assets/js/src.
<h3>GitHub</h3>
https://github.com/sproutient/Zypento-Wishlist-for-WooCommerce 
Clone the repository, Then to compile css/js from source, run ‘composer install’ once and whenever you want to compile, run ‘composer create-scripts’

Zypento Wishlist for WooCommerce

Add a heart button so customers can save products to a wishlist and manage it anytime from their My Account page.

nosoycesaros

A WordPress plugin designed to mark posts by logged in users. Allows theme developers and administrators create and edit post flags, like favorites, seen, likes, etc, also provides an easy way to put this flags in your theme via shortcode.
Features:
<ul>
<li>Administrators can create flags like ‘Favorites’, ‘Seen’ or ‘Bookmark’ for early use</li>
<li>You can create as many flags as you want</li>
<li>Allows customization of HTML code for each flag</li>
<li>Insert in themes and post via <code>[shortcode]</code></li>
<li>This plugin creates favorite flag and button by default</li>
</ul>

Post Flagger

Add Favorite or any flag button to your posts. The easy way

Zypento Wishlist for WooCommerce vs Post Flagger